var data = {
            body: "Bonjour",
            to:  "+208000000",
            attachement:{
                type: "image", //"pdf",
                name: "fileName",
                data: "base64Value"
            }
        }
        var options = {
            method: "POST",
            headers:{
            "Content-Type": "application/json",
            "X-WP-APPKEY": "WP-4glo7iR3ZbrXNQi31jifibXg99FBap/z20RiM8dB3UoMQiffVG60qJ97Ia1hq9Bb"
            },
            body: JSON.stringify(data)                
        }

        var url = "https://sandbox.wapplets.com/api/msg/send";

        var response = await fetch(url, options);

        if(response.ok){
            //Success
            var responseData = await response.json();
        } else {
            //Failure
            var responseData = await response.json();
        }

                                                            
                                                        

                                                            
       
        $url = "https://api.wapplets.com/api/msg/send";
        $data = array(
            'body' => 'Bonjour',
            'to' => '+208000000',
            'attachement'=>
            array(
                    'type'=> 'image', //"pdf"
                    'data'=>'base64Value',
                    'name'=>'fileName'
            )
        );
        
        
        $init = curl_init($url);
        $headers = array('Content-Type:application/json','X-WP-APPKEY:WP-4glo7iR3ZbrXNQi31jifibXg99FBap/z20RiM8dB3UoMQiffVG60qJ97Ia1hq9Bb');
        
        curl_setopt($init, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($init, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($init, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($init, CURLOPT_RETURNTRANSFER, true);
        
        $body = json_encode($data);
        curl_setopt($init, CURLOPT_POSTFIELDS, $body);
        
        $reponse_api = curl_exec($init); 
        $statusCode = curl_getinfo($init, CURLINFO_HTTP_CODE);
        curl_close($init);
        
        if($statusCode == 200){
        
            $responseData = json_decode($reponse_api, true);
            print_r($responseData);
            return $reponse_api;
        
        } else {
            echo "Failed to make the request.";
            return null;
        }
                                                                
                                                                
                                                                
                                                            
                                                        

                                                            
        String attachement = "{ \"type\": \"image\", \"data\": \"base64Value\", \"name\": \"fileName\" }";
                                                                
        OkHttpClient client = new OkHttpClient();
        RequestBody body = new FormBody.Builder() 
                    .add("to", "+208000000")
                    .add("body", "Bonjour")
                    .add("attachement", attachement)
                    .build();

        String url="https://sandbox.wapplets.com/api/msg/send";
        Request request = new Request.Builder()
            .url(url)
            .post(body)
            .addHeader("content-type", "application/json")
            .addHeader("X-WP-APPKEY", "WP-4glo7iR3ZbrXNQi31jifibXg99FBap/z20RiM8dB3UoMQiffVG60qJ97Ia1hq9Bb")
            .build();
        
        Response response = client.newCall(request).execute();
            
        System.out.println(response.body().string());
                                                            
                                                        

                                                            
        using System;
        using System.Threading.Tasks;
        using RestSharp;
        
        public class Program
        {
            public static async Task Main()
            {
        
                var url =   "https://sandbox.wapplets.com/api/msg/send";
                var client = new RestClient(url);
        
                var request = new RestRequest(url, Method.Post);    
                request.AddHeader("content-type", "application/json");
                request.addHeader("X-WP-APPKEY", "WP-4glo7iR3ZbrXNQi31jifibXg99FBap/z20RiM8dB3UoMQiffVG60qJ97Ia1hq9Bb")
                
                var attachement = "{ \"type\": \"image\", \"data\": \"base64Value\", \"name\": \"fileName\" }";

                request.AddParameter("to", "+208000000");
                request.AddParameter("body", "Bonjour");
                request.AddParameter("attachement", attachement);
        
        
                RestResponse response = await client.ExecuteAsync(request);
                var output = response.Content;
                Console.WriteLine(output);
            }
        }